Which control adjusts amplification of all reflections equally, regardless of depth?

• A. Master gain
• B. TGC
• C. Dynamic range
• D. Reject

Answer: (A)

Uniform amplification of echoes across all depths is achieved with the master gain control. This single knob increases or decreases the brightness of every reflection equally, so the overall image becomes brighter or darker without changing how strong deep echoes compare to shallow ones. Time Gain Compensation (TGC), on the other hand, is depth-dependent and boosts deeper echoes more (or less) to counteract attenuation with distance. Dynamic range defines how many gray shades are shown to represent signal strengths, affecting contrast rather than depth-based amplification. Reject filters out unwanted strong signals or noise, not uniform amplification. So the best answer is master gain.